I have an Incipio case that I bought at the AT&T store for $35. The price is a big con, and I don't like the way that it looks. It has a very nice shell the same color as my phone (purple), but then a rubber part that's an ugly grey. Plus, the rubber part attracts a lot of dust. OTOH, it does its job - I've dropped my phone several times already.

Here's the Doubleshot case. Just got it this afternoon from the Microsoft store. I don't think it makes the volume and power buttons too hard to operate. Feels very slim and unobtrusive. Big like! This is the Verizon employee edition in gray and yellow, so yellow accents still show and look good with the blue I think.

Just received the Diztronic and Cimo S-line cases from Amazon today. Diztronic is black and Cimo is clear. Both are made from TPU (thermoplastic polyurethane), which feels to be in between a soft silicone skin and a hard shell.

Both are nice but if you don't mind covering up the phone color, the Diztronic seems to be the nicer of the two. It's molded with better precision and has the same "soft touch" feel of the 8X case. The Cimo has a slight but noticeable raised seam line around the edge. Power button is covered on the Cimo case which makes pressing it more difficult where the Diztronic has a cutout. Volume and camera buttons are covered on both. I'll see about getting pictures up later...

The wife put one of these on her 8X. The fits like a glove, feels great, and color is spot on. The only problem I see if that the power button, which was already too recessed, requires even a harder press to activate the screen.

Just got the yellow and blue Speck Candyyshell Grip case from ATT (it was on sale!)
so far it fits very nice, doesnt add too much bulk and has raised edges, which is a big plus since I tend to drop my phone a lot!
I'll be posting pictures soon!

Still planning on buying the otterbox commuter series when the white/grey one comes out!

I've got the HTC Doubleshot (pics above), the Cimo S-line in pink, and the Verizon TPU gel case in purple. I like all 3 of them - they are all nice and slim and don't add much bulk, especially the Doubleshot. The thing the two TPU cases offer is better grip. The Doubleshot is slippery but it looks great and protects the back cover. The Cimo and Verizon cases rise up a little over the screen and so offer some protection if you place the phone face down.